The same cropduster I shot a few week ago also sprays for mosquitos for the county. When he buzzes over the neighborhood, he is seriously low. Usually just a few feet above the trees. I heard him start his runs tonight and I threw my 50mm f1.4 on my nice cool camera and ran out into the sauna we're experiencing. After a few very frustrating minutes trying to keep my lens clear, I was able to grab a few pics. Keep in mind it was about 8PM and I was only partially successful keeping my lens fog-free. These shots are also uncropped, so with a 50mm lens, you can see how low he is. The noise is awesome. Like a Stuka dive bomber.
First pass over my house. Those near trees are just on the edge of my yard.
His return pass.
Then he came across my house at 90° to his previous course as he headed back to the airport. Practically looking straight up as he passed overhead.